I just don't see how it would use less toilet paper if it's attempting to dry off a wet ass. Wet toilet paper sticks to everything, and barely takes away water.
Maybe if it was a paper towel it would get my ass totally dry without leaving bits of tissue paper on it, but that's not flushable and would end up being more paper usage for me.
I can imagine a world where my pants aren't wet. I just can't imagine one where it uses less paper or doesn't result in washcloths used only for drying anuses.